What items are considered biological and touch DNA evidence?

Biological and touch DNA evidence primarily includes organic materials that can yield genetic information. Blood, saliva, and hair are clear examples of biological materials because they contain DNA and can provide crucial evidence in criminal investigations. This type of evidence is significant because it can be used to identify individuals through DNA profiling, linking them to a crime scene or a victim.

The items listed in other choices do not fall into the category of biological and touch DNA evidence. For instance, fingerprints are considered trace evidence, whereas electronic devices and writings could contain relevant information but do not encompass biological material. Thus, organic materials like blood, saliva, or hair are foundational to DNA evidence in forensic science.